.filter {
  height: 40px;
  &_mask {
    position: fixed;
    top: 0;
    z-index: 996;
    height: calc(100vh - 50px);
    width: 100%;
    background-color:rgba(0, 0, 0, 0.55);
    transition: all .8s;
  }
  &_content {
    position: relative;
    z-index: 997;
  }
}
